I dehydrate my own meals and it works great. There is a big difference between freeze dried and dehydrated, so you should understand that before buying a new dehydrator for this reason. But if you already have one, there are lots of sites that have recipes listed. One thing you will hear is that when dehydrating don't use meat with any fat and get all of the fat off it that you can. That is true if you are going to store the stuff for years in a food saver bag and eat it when the world ends. but if you make them right before your trip, freeze them and then keep them dry and cool during your trip, you can use some fat.
I personally do a lot of things like red beans and rice with turkey sausage (and corn bread!!!) or spaghetti and Venison sauce. Cook those low fat meats, rinse them and clean the fat/oil out of the pan. Then cook them again just long enough to see that no more oil/fat is coming out of them. Rinse them and pat them in a paper towel. Then put them into your meal just like you would normally. Make the meal. Then just scoop it on the dehydrator. i try to put one serving (a real mans portion) on each tray. That way when it dries, you know that even tho it looks small each tray is a meal.
I put a little freezer paper in a Foodsaver bag, dump in the contents of one tray and then seal. Dried food gets sharp and hard. So it will punch a hole thru the foodsaver bags if you don't protect them. To reheat them, I made an "envelope" out of the thermal bubble sheets that you can buy at home depot.
So I will take out the freezer paper, line my bowl with that. Now I have just the meal in my foodsaver bag. Pour in my hot water, fold over the envelop and wait like you would a mountain house. Dump it out into my bowl, eat and then throw away the freezer paper and don't even have to wash the bowl.